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X79 PSU conundrum...

post #1 of 12
Thread Starter 
I already checked Phaedrus's PSU calculator so I am pretty sure I'll be okay, but I wanted to run this by you guys real quick just to be sure. I am planning a new build this week with a 3960X, Rampage IV Extreme, two GTX 580 Lightnings, 1 SSD, 1 HDD, and a Corsair H80. I have an AX850 from my sig rig that I plan to use in the new build but I wanted to make sure it will have enough juice for the system. It works fine now with basically all the same hardware except a 2600k and P67 Sabertooth.

Will moving to a 3960X clocked to around 4.7GHz pose a significant problem for the AX850? Thanks!
post #2 of 12
Quote:
Originally Posted by Majin SSJ Eric View Post

I already checked Phaedrus's PSU calculator so I am pretty sure I'll be okay, but I wanted to run this by you guys real quick just to be sure. I am planning a new build this week with a 3960X, Rampage IV Extreme, two GTX 580 Lightnings, 1 SSD, 1 HDD, and a Corsair H80. I have an AX850 from my sig rig that I plan to use in the new build but I wanted to make sure it will have enough juice for the system. It works fine now with basically all the same hardware except a 2600k and P67 Sabertooth.
Will moving to a 3960X clocked to around 4.7GHz pose a significant problem for the AX850? Thanks!

Yes, 4.7GHz on the cpu and about 900Mhz on the 580s should be fine. But anything higher will put a heavy stress on that psu. SB-E is a power hog.
    
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post #3 of 12
Thread Starter 
Quote:
Originally Posted by MrTOOSHORT View Post

Yes, 4.7GHz on the cpu and about 900Mhz on the 580s should be fine. But anything higher will put a heavy stress on that psu. SB-E is a power hog.

That's what I figured. :/ Problem is I am going to do some benching with the 580's then turn them in for 7970's. I know the 7970's will be much more efficient so I'd hate to replace the AX850 just to bench some 580's I'm going to get rid of. What would you suggest I do? Go with an AX1200 or stick with the 850 and hope it holds out?
post #4 of 12
I have a HCP-850, then tried the 3960x with it. It was pretty much fine, but the fan started to finally ramp up on the HCP-850 during benching telling me it was working hard. Otherwise it would never make a noise. Thing didn't even stress with my old set up (990x with same gpus)

Since I went all out with my build, I went all out with my psu too.thumb.gif

I think the AX1200 would be a fine psu, but a solid 1000w will do imo.

First I'd just stay put until you get your 7970s and then see if you really need the psu upgrade. That's how I approached changing mine out.
Edited by MrTOOSHORT - 2/10/12 at 10:53am
    
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post #5 of 12
Are you benching everything on LN2/LHe!?.. if not than you're perfectly fine, absolutely nothing to worry about.
post #6 of 12
Quote:
Originally Posted by Majin SSJ Eric View Post

Quote:
Originally Posted by MrTOOSHORT View Post

Yes, 4.7GHz on the cpu and about 900Mhz on the 580s should be fine. But anything higher will put a heavy stress on that psu. SB-E is a power hog.

That's what I figured. :/ Problem is I am going to do some benching with the 580's then turn them in for 7970's. I know the 7970's will be much more efficient so I'd hate to replace the AX850 just to bench some 580's I'm going to get rid of. What would you suggest I do? Go with an AX1200 or stick with the 850 and hope it holds out?


If you run everything on stock clocks, the AX850 will be fine. The 3960X and 580s/7970s overclocked on air or water is a different story.

 

This is the power draw from the wall post #2 with a single 7970 + Q9550 E0 3825MHz 1.36V.

ケンジ
(16 items)
 
  
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i7-3960X i7-980X GA-X79-UD7 / GA-X58A-UD9 7970 + 465 
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120GB x 4 RAID0 Raptor 300GB x 2 RAID0 CPU-370 CPU-370 
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ケンジ
(16 items)
 
  
CPUCPUMotherboardGraphics
i7-3960X i7-980X GA-X79-UD7 / GA-X58A-UD9 7970 + 465 
GraphicsRAMRAMHard Drive
2x 6990 + 580 16GB 2133 MHz 24GB 2000 MHz 120GB x 2 RAID0 
Hard DriveHard DriveCoolingCooling
120GB x 4 RAID0 Raptor 300GB x 2 RAID0 CPU-370 CPU-370 
CoolingCoolingOSPower
VID-AR699 EK FB X58A-UD9 Win 7 Ultimate x64 1500W / 1250W+1200W 
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post #7 of 12
Thread Starter 
Its okay, I went ahead and ordered an AX1200 just to be totally safe. Plus i can add extra 7970's later on if i want...
post #8 of 12
Quote:
Originally Posted by Majin SSJ Eric View Post

Its okay, I went ahead and ordered an AX1200 just to be totally safe. Plus i can add extra 7970's later on if i want...

You're following poor advice, bad reasoning and failed logic... you don't need more than the AX850 can offer, not to mention it's one of the best 850W PSUs on the market.
post #9 of 12
Thread Starter 
I'm betting that I would have been fine with the AX850 (especially with the super efficient 7970's) but I figured if I'm going all-out with a 3960X, Rampage IV Extreme, Viper X Division 4 RAM, and dual Asus DirectCU II 7970's, I might as well round that off with one of the most bad ass PSU's on the market. The AX1200 will look bauss in my rig and I can sell the 850 to recoup some of the cash....
post #10 of 12
Quote:
Originally Posted by Majin SSJ Eric View Post

I'm betting that I would have been fine with the AX850 (especially with the super efficient 7970's) but I figured if I'm going all-out with a 3960X, Rampage IV Extreme, Viper X Division 4 RAM, and dual Asus DirectCU II 7970's, I might as well round that off with one of the most bad ass PSU's on the market. The AX1200 will look bauss in my rig and I can sell the 850 to recoup some of the cash....

Nice choice of cards wink.gif
You can get better PSUs than the AX1200 at that kind of cash.. the HCP 1200, the Seasonic/XFX Platinum 1000 or the Kingwin Platinum 1000 are all superior and I bet you can find all of them cheaper.
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